Dielectric Property of High Density CaCu3Ti4O12 Ceramics

doi:10.3724/SP.J.1077.2014.13050

Abstract

Abstract: High density CaCu₃Ti₄O₁₂ ceramics was prepared by the hot-press sintering technique, and their microstructure, crystalline structure and dielectric property were investigated. The hot-pressed ceramics exhibit the microstructure of bimodal grain distribution with a high theoretical relative density of 98.3%. X-ray diffraction analysis shows that there is Cu₂O minor phase in the hot-pressed ceramics whereas only CuO secondary phase exists after a further thermal treatment in ambience. Both the hot-pressed ceramics and its further thermally treated one exhibit two dielectric relaxations at room temperature, whereas the conventionally sintered ceramics have only one dielectric relaxation. Moreover, the hot-pressed CCTO ceramics have an extremely large low-frequency permittivity of 2×10⁵, which further increases to nearly 1×10⁶ through the ambient thermal treatment. The relation between microstructure and dielectric property is also discussed.

Key words: hot-press sintering technique, CaCu₃Ti₄O₁₂, microstructure, dielectric property

CLC Number:

TM283

HAO Wen-Tao, ZHANG Jia-Liang, XU Pan-Pan, CAO En-Si, PENG Hua. Dielectric Property of High Density CaCu₃Ti₄O₁₂ Ceramics[J]. Journal of Inorganic Materials, 2014, 29(1): 67-70.

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Dielectric Property of High Density CaCu₃Ti₄O₁₂ Ceramics

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